I would say trebles hook more fish, but they are a real pain to take out when trying to release fish. I use both, when LEGAL to do so. That is my first check, if there is a closure on trebles. Then I look at water. If clear, small single hooks seem to work for me. I don't know about landing more or less with one or the other. I seem to lose or miss about the same.

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Just because I look big, dumb, and ugly, doesn't mean I am. It means I can stomp you for calling me it!